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Do Now: 4/16

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Properties of Sound: Pitch

Music

Consonant: Certain sound waves which, when played simultaneously, will produce a pleasant sound

Example:

Two musical notes that have a frequency ratio of 2:1 are said to be separated by an octave. A musical note that is separated by an octave from middle C (256 Hz) has a frequency of _____.

a. 128 Hz

b. 254 Hz

c. 258 Hz

d. 345 Hz

e. none of these

Review: Amplitude

Amplitude represents energy

Properties of Sound: Loudness

Loudness depends on the amplitude of sound waves; measured in decibels (dB)

Intensity (I): how loud a sound is in relation to another

Example:

A mosquito's buzz is often rated with a decibel rating of 40 dB. Normal conversation is often rated at 60 dB. How many times more intense is normal conversation compared to a mosquito's buzz?

a. 2

b. 20

c. 100

d. 200

e. 400

Speed of Sound:

The speed of sound depends primarily on medium but also on temperature:

v = 331 m/s + (0.6 m/s/C)•T

Example:

Determine the speed of a sound wave in air at a temperature of 20ºC.

v = 331 m/s + (0.6 m/s/C)•T

v = 331 m/s + (0.6m/s/C)•(20 C)

v = 331 m/s + 12 m/s

v = 343 m/s

Echo:

echo: a reflected sound; will take twice the time to travel the same distance

Example: a sound wave travels 500 m to a cliff, then returns to where it started. If the sound wave traveled 330 m/s, how long does it take the sound to return to where it started?

Practice:

Use the rest of class to work on the worksheet “Sound Waves.”

Be prepared to answer an exit question at the end of class

Exit Question:

Which property of sound is determined by amplitude?

Which property of sound is determined by frequency?

Do Now (4/17/12):

Which property of sound is determined by amplitude?

Which property of sound is determined by frequency?

What is the velocity of sound when the temperature is 44˚ C?

Agenda:

4th Q Project

Homework questions

Extra credit (optional)

Fourth quarter project

Deadline 1: TOMORROW

Bring in your favorite piece of art, or any art piece that speaks to you. It can be a drawing, a painting, a sculpture, etc. You may make a photocopy, or print it from a computer, but you MUST have a hard copy with you… on your phone doesn’t count!!!

You will also write a paragraph about your piece, but we will do that tomorrow.

Practice:

Work on homework

Work on extra credit (optional) – if you want extra credit, the work must be submitted by the end of class

Begin thinking about your art piece – feel free to look through your history or English textbook once you have finished your work.